Trick to use Keyboard LED for Network Activity Indication:
Download this Simple software from here:
Network lights is simple windows software that can blinks the keyboard's LED whenever there is packet transfer occurred(incoming and outgoing). Network lights is stand alone software(no need to install)
Run the program by double clicking the NetworkLights.exe file. Now you can see the traffic light icon in system tray.
Click the Settings for customisation , if it is necessary.
that's all ..!!!
if there is incoming packets means, the scroll lock will blink(depending on your settings).
if there is outgoing packets menas, the Num lock will blink(depending on your settings).
Just select Exit option , if you don't need this indication